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3 years ago

(x = 3) Solve: 5х + 6 = 21

Mathematics

1 answer:

Pani-rosa [81]3 years ago

8 0

Answer:

5x+6=21 is the same as 15+6=21

Step-by-step explanation:

hope this is what you wanted :)

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Determine the factors of x2 − 8x − 12.

Mila [183]

This polynomial cannot be factored because it is prime. Hope this helps. :)

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3 years ago

Read 2 more answers

Evaluate 3 to the 2nd power + (8-2)•4-6/3

erma4kov [3.2K]

$3^{2}+(8-2)×4-6/3$

Always do what's in parentheses first:

$3^{2}+6×4-6/3$

Then do multiplication and division:

$9+24-2$

Then addition and subtraction last:

$9+24-2=31$

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4 years ago

Solve for x: 3(x + 1) = -2(x - 1) - 4

shepuryov [24]

Answer:

x = -1

Step-by-step explanation:

3(x+1) = -2(x-1) - 4

3x + 3 = -2x + 2 - 4

3x + 3 = -2x - 2

Add the -2x to both sides

5x + 3 = -2

Subtract the 3 to both sides

5x = -5

Divide both sides by 5

x = -1

4 0

3 years ago

Complete the square 2x2- 12x+ 26 = 10

Mariana [72]

$2x^2-12x+26=10\ \ \ | subtract\ 10\\\\
2x^2-12x+16=0\ \ \ | divide\ by\ 2\\\\
x^2-6x+8=0\\\\
put\ into\ form:\ (x+d)^2+c=0\\
-6x=2xd\ \ \ | divide\ by\ x\\
d=-3\\
8=d^2+c\\
8=9+c\ \ \ | subtract\ 9\\
c=-1\\\\
After\ completing\ the\ square:\\
(x-3)^2-1=0$

4 0

4 years ago

Find the length of the third side. If necessary, write in simplest radical form.

Zanzabum

Answer:

Step-by-step explanation:

We have to find a leg, so we have to use the Pythagorean theorem in this way:

$\sqrt{7^2 - 4^2} = \sqrt{49 - 16} = \sqrt{33}$

6 0

3 years ago